Previous script: “06_get_eigengene_QTL.Rmd”

The goal is to find QTL peaks for the WGCNA eigen genes and see if those overalp with any growth QTL. We are only focusing on eigen genes that correlated with some growth traits/paramters.

library(GenomicRanges)
Loading required package: stats4
Loading required package: BiocGenerics
Loading required package: parallel

Attaching package: ‘BiocGenerics’

The following objects are masked from ‘package:parallel’:

    clusterApply, clusterApplyLB, clusterCall, clusterEvalQ, clusterExport, clusterMap,
    parApply, parCapply, parLapply, parLapplyLB, parRapply, parSapply, parSapplyLB

The following objects are masked from ‘package:stats’:

    IQR, mad, sd, var, xtabs

The following objects are masked from ‘package:base’:

    anyDuplicated, append, as.data.frame, basename, cbind, colMeans, colnames, colSums,
    dirname, do.call, duplicated, eval, evalq, Filter, Find, get, grep, grepl, intersect,
    is.unsorted, lapply, lengths, Map, mapply, match, mget, order, paste, pmax, pmax.int,
    pmin, pmin.int, Position, rank, rbind, Reduce, rowMeans, rownames, rowSums, sapply,
    setdiff, sort, table, tapply, union, unique, unsplit, which, which.max, which.min

Loading required package: S4Vectors

Attaching package: ‘S4Vectors’

The following object is masked from ‘package:base’:

    expand.grid

Loading required package: IRanges
Loading required package: GenomeInfoDb
library(qtl)
library(tidyverse)
── Attaching packages ───────────────────────────────────────────────────────────────── tidyverse 1.2.1 ──
✔ ggplot2 3.0.0     ✔ purrr   0.2.5
✔ tibble  1.4.2     ✔ dplyr   0.7.6
✔ tidyr   0.8.1     ✔ stringr 1.3.1
✔ readr   1.1.1     ✔ forcats 0.3.0
── Conflicts ──────────────────────────────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::collapse()   masks IRanges::collapse()
✖ dplyr::combine()    masks BiocGenerics::combine()
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✖ tidyr::expand()     masks S4Vectors::expand()
✖ dplyr::filter()     masks stats::filter()
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✖ purrr::reduce()     masks GenomicRanges::reduce(), IRanges::reduce()
✖ dplyr::rename()     masks S4Vectors::rename()
✖ dplyr::slice()      masks IRanges::slice()
library(stringr)
load("../output/scanone-eigengene-qtl_2012.RData")

scanone imp

Plot QTL

threshold.95 <- tibble(perm.threshold=lod.thrs[5,],
                       trait=colnames(lod.thrs))
scanone.gather <- scanone_eigen %>%
  gather(key = trait, value = LOD, -chr, -pos) %>%
  mutate(condition=str_sub(trait,1,2), color=str_sub(trait,6,100)) %>%
  left_join(threshold.95)
Joining, by = "trait"
scanone.gather
   pl.UN <- scanone.gather %>% filter(condition=="UN") %>%
  ggplot(aes(x=pos,y=LOD)) +
  geom_line() +
  geom_hline(aes(yintercept=perm.threshold),lty=2,lwd=.5,alpha=.5) +
  facet_grid(trait ~ chr, scales="free") +
  theme(strip.text.y = element_text(angle=0), axis.text.x = element_text(angle=90)) +
  ggtitle("UN Eigen Gene QTL")
pl.UN
ggsave("../output/eigen gene eQTL UN 2012.pdf",width=12,height=8)

Look for overlap

For each eigen gene, find QTL borders and look for overlap with growth QTL

For each eigen gene first identify chromosomes with “significant” peaks (in this case > 99% permuation threshold) and then run bayesint() on them to define the intervals

sig.chrs <- scanone.gather %>% filter(LOD > perm.threshold) %>%
  group_by(trait,chr) %>%
  summarize(unique(chr))
sig.chrs

now for each significant chromosome/trait combo run bayesint

scanone_eigen.phys <- scanone_eigen[!str_detect(rownames(scanone_eigen),"^cA"),]
bayesint.list <- apply(sig.chrs,1,function(hit) {
    result <- bayesint(scanone_eigen.phys[c("chr","pos",hit["trait"])], 
                     chr=hit["chr"], 
                     lodcolumn = 1,
                     expandtomarkers = TRUE
  )
  colnames(result)[3] <- "LOD"
  result
})
names(bayesint.list) <- sig.chrs$trait
bayesint.list <- lapply(bayesint.list,function(x) x %>% 
                          as.data.frame() %>%
                          rownames_to_column(var="markername")  %>%
                          mutate(chr=as.character(chr))
)
bayesint.result <- as.tibble(bind_rows(bayesint.list,.id="trait")) %>% 
  select(trait,chr,pos,markername,LOD) %>%
  separate(markername,into=c("chr1","Mbp"),sep="x", convert=TRUE) %>%
  group_by(trait,chr) %>% 
  summarize(start=min(Mbp),end=max(Mbp),min_eQTL_LOD=min(LOD),max_eQTL_LOD=max(LOD)) %>% 
  #for the high QTL peaks the interval width is 0.  That is overly precise and need to widen those.
  mutate(start=ifelse(start==end,max(0,start-20000),start), end=ifelse(start==end,end+20000,end))
  
  
bayesint.result

annotate Eigen gene QTL

Load annotation

BrapaAnnotation <- read_csv("../input/Brapa_V1.5_annotated.csv")
Missing column names filled in: 'X1' [1]Parsed with column specification:
cols(
  X1 = col_integer(),
  name = col_character(),
  chrom = col_character(),
  start = col_integer(),
  end = col_integer(),
  subject = col_character(),
  AGI = col_character(),
  At_symbol = col_character(),
  At_description = col_character(),
  perc_ID = col_double(),
  aln_length = col_integer(),
  mismatch = col_integer(),
  gap_open = col_integer(),
  qstart = col_integer(),
  qend = col_integer(),
  sstart = col_integer(),
  send = col_integer(),
  eval = col_double(),
  score = col_double()
)
BrapaAnnotation
eigen.annotated <- lapply(1:nrow(bayesint.result),function(row) {
  qtl <- bayesint.result[row,]
  results <- subset(BrapaAnnotation, chrom==qtl$chr &
                    start >= qtl$start &
                    end <= qtl$end)
}
)
names(eigen.annotated) <- bayesint.result$trait
eigen.annotated <- bind_rows(eigen.annotated,.id="trait") %>%
  mutate(chrom=as.character(chrom)) %>%
  left_join(bayesint.result,by=c("trait","chrom"="chr")) %>% #get eQTL LOD
  rename(eigen_eQTL_candidate=name)
eigen.annotated.small <- eigen.annotated %>% select(trait,eigen_eQTL_candidate,ends_with("LOD"))
eigen.annotated.small

given bayesint results, find overlaps with UN growth QTL

filepath <- "../input/All2012HeightQTL2.xlsx"
filebase <- filepath %>% basename() %>% str_replace("\\..*$","")
QTLgenes <- readxl::read_excel(filepath)[,-1]
QTLgenes <- QTLgenes %>% dplyr::rename(.id=QTL, FVTtrait=FVT) # change names to match previous file
QTLgenes <- QTLgenes %>% filter(str_detect(FVTtrait,"^UN"))
QTLgenes
eigen.qtl.combined <- inner_join(eigen.annotated.small,QTLgenes,by=c("eigen_eQTL_candidate"="name")) %>%
  select(.id, trait, everything())
eigen.qtl.combined

how many QTL have at least some overlap?

sort(unique(QTLgenes$.id))
 [1] "QTL1"  "QTL12" "QTL13" "QTL14" "QTL15" "QTL16" "QTL17" "QTL18" "QTL19" "QTL2"  "QTL3"  "QTL33"
[13] "QTL34" "QTL35" "QTL6"  "QTL7" 
sort(unique(eigen.qtl.combined$.id))
[1] "QTL1"  "QTL13" "QTL14" "QTL19" "QTL3"  "QTL35" "QTL6"  "QTL7" 

three of four

are all eigen genes overlapping?

unique(eigen.annotated.small$trait)
 [1] "UN_MEblue"          "UN_MEbrown"         "UN_MEcyan"          "UN_MEdarkslateblue"
 [5] "UN_MElightgreen"    "UN_MEmidnightblue"  "UN_MEpurple"        "UN_MEsteelblue"    
 [9] "UN_MEturquoise"     "UN_MEyellow"        "UN_MEyellowgreen"  
unique(eigen.qtl.combined$trait)
[1] "UN_MEblue"          "UN_MEbrown"         "UN_MEcyan"          "UN_MEdarkslateblue"
[5] "UN_MEmidnightblue"  "UN_MEpurple"        "UN_MEturquoise"     "UN_MEyellow"       
[9] "UN_MEyellowgreen"  

No, 7 of 11

write_csv(eigen.qtl.combined,
          path=str_c("../output/", filebase, "_eigenQTL_overlap_", Sys.Date(), ".csv"))

overlaps and significance

first convert things to ranges

qtl.info <- QTLgenes %>%
  group_by(.id) %>%
  summarize(chrom=unique(chrom),start=min(start),end=max(end))
qtl.info
qtl.ranges <- GRanges(seqnames = qtl.info$chrom,ranges=IRanges(start=qtl.info$start,end=qtl.info$end))
qtl.ranges <- GenomicRanges::reduce(qtl.ranges)
eQTL.ranges <- GRanges(bayesint.result$chr,
                       ranges = IRanges(start=bayesint.result$start,
                                        end=bayesint.result$end))
eQTL.ranges <- GenomicRanges::reduce(eQTL.ranges)

Make table of chromosome info

chr.info <- scanone_eigen.phys %>% 
  as.data.frame() %>%
  rownames_to_column("marker") %>%
  select(marker) %>%
  separate(marker,into=c("chr","bp"),sep="x",convert=TRUE) %>%
  group_by(chr) %>%
  summarize(start=min(bp),end=max(bp))

Do the simulations

sims <- 1000
set.seed(2323)
sim.results <- sapply(1:sims, function(s) {
  if (s %% 100 == 0) print(s)
  sim.eQTL <- tibble(
    chr=sample(chr.info$chr,
               size = length(eQTL.ranges),
               replace = TRUE,
               prob=chr.info$end/sum(chr.info$end)),
    width=width(eQTL.ranges) # width of the QTL to simulate
  )
  sim.eQTL <- chr.info %>% 
    select(chr,chr.start=start,chr.end=end) %>% right_join(sim.eQTL,by="chr") #need to get the chrom end so we can sample correctly
  sim.eQTL <- sim.eQTL %>% mutate(qtl.start = runif(n=n(),
                                                    min = chr.start,
                                                    max= max(chr.start,chr.end-width)),
                                  qtl.end=qtl.start+width)
  sim.eQTL.ranges <- GRanges(seqnames = sim.eQTL$chr,
                             ranges = IRanges(start=sim.eQTL$qtl.start,
                                              end=sim.eQTL$qtl.end))
  
  suppressWarnings(result <- sum(countOverlaps(qtl.ranges,sim.eQTL.ranges)>0))
  result
})
[1] 100
[1] 200
[1] 300
[1] 400
[1] 500
[1] 600
[1] 700
[1] 800
[1] 900
[1] 1000
true.overlap <- sum(countOverlaps(qtl.ranges,eQTL.ranges)) #OK to ignore warnings
Each of the 2 combined objects has sequence levels not in the other:
  - in 'x': A09, A05
  - in 'y': A08
  Make sure to always combine/compare objects based on the same reference
  genome (use suppressWarnings() to suppress this warning).
true.overlap
[1] 4
mean(sim.results >= true.overlap)
[1] 0.065
tibble(FVTQTL_vs_MReQTL_True_Overlaps=true.overlap,
       N_Simulations_fewer_overlaps=sum(sim.results < true.overlap),
       N_Simulations_greater_equal_overlaps=sum(sim.results >= true.overlap),
       P_value=mean(sim.results >= true.overlap)
) %>%
  write_csv(str_c("../output/", filebase, "_WGCNA_eigen_eQTL_scanone_overlap_pval_", Sys.Date(), ".csv"))

cim

Plot QTL

threshold.95 <- tibble(perm.threshold=lod.thrs.cim[5,],
                       trait=colnames(lod.thrs.cim))
scanone.gather <- scanone_eigen_cim %>%
  gather(key = trait, value = LOD, -chr, -pos) %>%
  mutate(condition=str_sub(trait,1,2), color=str_sub(trait,6,100)) %>%
  left_join(threshold.95)
Joining, by = "trait"
scanone.gather
   pl.UN <- scanone.gather %>% filter(condition=="UN") %>%
  ggplot(aes(x=pos,y=LOD)) +
  geom_line() +
  geom_hline(aes(yintercept=perm.threshold),lty=2,lwd=.5,alpha=.5) +
  facet_grid(trait ~ chr, scales="free") +
  theme(strip.text.y = element_text(angle=0), axis.text.x = element_text(angle=90)) +
  ggtitle("UN Eigen Gene QTL")
pl.UN
ggsave("../output/eigen gene eQTL UN CIM 2012.pdf",width=12,height=8)

Look for overlap

For each eigen gene, find QTL borders and look for overlap with growth QTL

For each eigen gene first identify chromosomes with “significant” peaks (in this case > 99% permuation threshold) and then runs bayesint() on them to define the intervals

sig.chrs <- scanone.gather %>% filter(LOD > perm.threshold) %>%
  group_by(trait,chr) %>%
  summarize(unique(chr))
sig.chrs

now for each significant chromosome/trait combo run bayesint

#remove markers without physical position
scanone_eigen_cim.phys <- scanone_eigen_cim[!str_detect(rownames(scanone_eigen),"^cA"),]
bayesint.list <- apply(sig.chrs,1,function(hit) {
    result <- bayesint(scanone_eigen_cim.phys[c("chr","pos",hit["trait"])], 
                     chr=hit["chr"], 
                     lodcolumn = 1,
                     expandtomarkers = TRUE
  )
  colnames(result)[3] <- "LOD"
  result
})
names(bayesint.list) <- sig.chrs$trait
bayesint.list <- lapply(bayesint.list,function(x) x %>% 
                          as.data.frame() %>%
                          rownames_to_column(var="markername")  %>%
                          mutate(chr=as.character(chr))
)
bayesint.result <- as.tibble(bind_rows(bayesint.list,.id="trait")) %>% 
  select(trait,chr,pos,markername,LOD) %>%
  separate(markername,into=c("chr1","Mbp"),sep="x", convert=TRUE) %>%
  group_by(trait,chr) %>% 
  summarize(start=min(Mbp),end=max(Mbp),min_eQTL_LOD=min(LOD),max_eQTL_LOD=max(LOD)) %>% 
  #for the high QTL peaks the interval width is 0.  That is overly precise and need to widen those.
  mutate(start=ifelse(start==end,max(0,start-20000),start), end=ifelse(start==end,end+20000,end))
  
  
bayesint.result

annotate Eigen gene QTL

Load annotation

BrapaAnnotation <- read_csv("../input/Brapa_V1.5_annotated.csv")
Missing column names filled in: 'X1' [1]Parsed with column specification:
cols(
  X1 = col_integer(),
  name = col_character(),
  chrom = col_character(),
  start = col_integer(),
  end = col_integer(),
  subject = col_character(),
  AGI = col_character(),
  At_symbol = col_character(),
  At_description = col_character(),
  perc_ID = col_double(),
  aln_length = col_integer(),
  mismatch = col_integer(),
  gap_open = col_integer(),
  qstart = col_integer(),
  qend = col_integer(),
  sstart = col_integer(),
  send = col_integer(),
  eval = col_double(),
  score = col_double()
)

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BrapaAnnotation
eigen.annotated <- lapply(1:nrow(bayesint.result),function(row) {
  qtl <- bayesint.result[row,]
  results <- subset(BrapaAnnotation, chrom==qtl$chr &
                    start >= qtl$start &
                    end <= qtl$end)
}
)
names(eigen.annotated) <- bayesint.result$trait
eigen.annotated <- bind_rows(eigen.annotated,.id="trait") %>%
  mutate(chrom=as.character(chrom)) %>%
  left_join(bayesint.result,by=c("trait","chrom"="chr")) %>% #get eQTL LOD
  rename(eigen_eQTL_candidate=name)
eigen.annotated.small <- eigen.annotated %>% select(trait,eigen_eQTL_candidate,ends_with("LOD"))
eigen.annotated.small

given bayesint results, find overlaps with UN growth QTL

filepath <- "../input/All2012HeightQTL2.xlsx"
filebase <- filepath %>% basename() %>% str_replace("\\..*$","")
QTLgenes <- readxl::read_excel(filepath)[,-1]
QTLgenes <- QTLgenes %>% dplyr::rename(.id=QTL, FVTtrait=FVT) # change names to match previous file
QTLgenes <- QTLgenes %>% filter(str_detect(FVTtrait,"^UN"))
QTLgenes
eigen.qtl.combined <- inner_join(eigen.annotated.small,QTLgenes,by=c("eigen_eQTL_candidate"="name")) %>%
  select(.id, trait, everything())
eigen.qtl.combined

how many QTL have at least some overlap?

unique(QTLgenes$.id)
 [1] "QTL1"  "QTL12" "QTL13" "QTL14" "QTL15" "QTL16" "QTL17" "QTL18" "QTL19" "QTL2"  "QTL3"  "QTL33"
[13] "QTL34" "QTL35" "QTL6"  "QTL7" 
unique(eigen.qtl.combined$.id)
[1] "QTL3"  "QTL7"  "QTL19" "QTL1"  "QTL13" "QTL6" 

two of four

are all eigen genes overlapping?

unique(eigen.annotated.small$trait)
[1] "UN_MEblue"          "UN_MEbrown"         "UN_MEcyan"          "UN_MEdarkslateblue"
[5] "UN_MElightgreen"    "UN_MEmidnightblue"  "UN_MEsteelblue"     "UN_MEturquoise"    
[9] "UN_MEyellowgreen"  
unique(eigen.qtl.combined$trait)
[1] "UN_MEbrown"         "UN_MEcyan"          "UN_MEdarkslateblue" "UN_MEmidnightblue" 
[5] "UN_MEturquoise"     "UN_MEyellowgreen"  

No, 2

write_csv(eigen.qtl.combined,
          path=str_c("../output/", filebase, "_eigenQTL_overlap_CIM_", Sys.Date(), ".csv"))

overlaps and signficance

eQTL.ranges <- GRanges(bayesint.result$chr,
                       ranges = IRanges(start=bayesint.result$start,
                                        end=bayesint.result$end))
eQTL.ranges <- GenomicRanges::reduce(eQTL.ranges)

Do the simulations

sims <- 1000
set.seed(4545)
sim.results <- sapply(1:sims, function(s) {
  if (s %% 100 == 0) print(s)
  sim.eQTL <- tibble(
    chr=sample(chr.info$chr,
               size = length(eQTL.ranges),
               replace = TRUE,
               prob=chr.info$end/sum(chr.info$end)),
    width=width(eQTL.ranges) # width of the QTL to simulate
  )
  sim.eQTL <- chr.info %>% 
    select(chr,chr.start=start,chr.end=end) %>% right_join(sim.eQTL,by="chr") #need to get the chrom end so we can sample correctly
  sim.eQTL <- sim.eQTL %>% mutate(qtl.start = runif(n=n(),
                                                    min = chr.start,
                                                    max= max(chr.start,chr.end-width)),
                                  qtl.end=qtl.start+width)
  sim.eQTL.ranges <- GRanges(seqnames = sim.eQTL$chr,
                             ranges = IRanges(start=sim.eQTL$qtl.start,
                                              end=sim.eQTL$qtl.end))
  
  suppressWarnings(result <- sum(countOverlaps(qtl.ranges,sim.eQTL.ranges)>0))
  result
})
[1] 100
[1] 200
[1] 300
[1] 400
[1] 500
[1] 600
[1] 700
[1] 800
[1] 900
[1] 1000
true.overlap <- sum(countOverlaps(qtl.ranges,eQTL.ranges)) #OK to ignore warnings
true.overlap
[1] 4
mean(sim.results >= true.overlap)
[1] 0.005
tibble(FVTQTL_vs_MReQTL_True_Overlaps=true.overlap,
       N_Simulations_fewer_overlaps=sum(sim.results < true.overlap),
       N_Simulations_greater_equal_overlaps=sum(sim.results >= true.overlap),
       P_value=mean(sim.results >= true.overlap)
) %>%
  write_csv(str_c("../output/", filebase, "_WGCNA_eigen_eQTL_CIM_overlap_pval_", Sys.Date(), ".csv"))
---
title: "Analyze Eigen Gene QTL"
output: html_notebook
author: "Julin Maloof"
---


Previous script: "06_get_eigengene_QTL.Rmd"

The goal is to find QTL peaks for the WGCNA eigen genes and see if those overalp with any growth QTL.  We are only focusing on eigen genes that correlated with some growth traits/paramters.

```{r}
library(GenomicRanges)
library(qtl)
library(tidyverse)
library(stringr)
load("../output/scanone-eigengene-qtl_2012.RData")
```

# scanone imp

## Plot QTL

```{r}

threshold.95 <- tibble(perm.threshold=lod.thrs[5,],
                       trait=colnames(lod.thrs))

scanone.gather <- scanone_eigen %>%
  gather(key = trait, value = LOD, -chr, -pos) %>%
  mutate(condition=str_sub(trait,1,2), color=str_sub(trait,6,100)) %>%
  left_join(threshold.95)

scanone.gather
```

```{r}
   pl.UN <- scanone.gather %>% filter(condition=="UN") %>%
  ggplot(aes(x=pos,y=LOD)) +
  geom_line() +
  geom_hline(aes(yintercept=perm.threshold),lty=2,lwd=.5,alpha=.5) +
  facet_grid(trait ~ chr, scales="free") +
  theme(strip.text.y = element_text(angle=0), axis.text.x = element_text(angle=90)) +
  ggtitle("UN Eigen Gene QTL")
pl.UN
ggsave("../output/eigen gene eQTL UN 2012.pdf",width=12,height=8)
```


## Look for overlap

For each eigen gene, find QTL borders and look for overlap with growth QTL

For each eigen gene first identify chromosomes with "significant" peaks (in this case > 99% permuation threshold) and then run bayesint() on them to define the intervals

```{r}
sig.chrs <- scanone.gather %>% filter(LOD > perm.threshold) %>%
  group_by(trait,chr) %>%
  summarize(unique(chr))
sig.chrs
```

now for each significant chromosome/trait combo run bayesint

```{r}
scanone_eigen.phys <- scanone_eigen[!str_detect(rownames(scanone_eigen),"^cA"),]

bayesint.list <- apply(sig.chrs,1,function(hit) {
    result <- bayesint(scanone_eigen.phys[c("chr","pos",hit["trait"])], 
                     chr=hit["chr"], 
                     lodcolumn = 1,
                     expandtomarkers = TRUE
  )
  colnames(result)[3] <- "LOD"
  result
})

names(bayesint.list) <- sig.chrs$trait

bayesint.list <- lapply(bayesint.list,function(x) x %>% 
                          as.data.frame() %>%
                          rownames_to_column(var="markername")  %>%
                          mutate(chr=as.character(chr))
)

bayesint.result <- as.tibble(bind_rows(bayesint.list,.id="trait")) %>% 
  select(trait,chr,pos,markername,LOD) %>%
  separate(markername,into=c("chr1","Mbp"),sep="x", convert=TRUE) %>%
  group_by(trait,chr) %>% 
  summarize(start=min(Mbp),end=max(Mbp),min_eQTL_LOD=min(LOD),max_eQTL_LOD=max(LOD)) %>% 
  #for the high QTL peaks the interval width is 0.  That is overly precise and need to widen those.
  mutate(start=ifelse(start==end,max(0,start-20000),start), end=ifelse(start==end,end+20000,end))
  
  
bayesint.result
```

### annotate Eigen gene QTL

Load annotation
```{r}
BrapaAnnotation <- read_csv("../input/Brapa_V1.5_annotated.csv")
BrapaAnnotation
```

```{r}
eigen.annotated <- lapply(1:nrow(bayesint.result),function(row) {
  qtl <- bayesint.result[row,]
  results <- subset(BrapaAnnotation, chrom==qtl$chr &
                    start >= qtl$start &
                    end <= qtl$end)
}
)
names(eigen.annotated) <- bayesint.result$trait

eigen.annotated <- bind_rows(eigen.annotated,.id="trait") %>%
  mutate(chrom=as.character(chrom)) %>%
  left_join(bayesint.result,by=c("trait","chrom"="chr")) %>% #get eQTL LOD
  rename(eigen_eQTL_candidate=name)

eigen.annotated.small <- eigen.annotated %>% select(trait,eigen_eQTL_candidate,ends_with("LOD"))

eigen.annotated.small
```

given bayesint results, find overlaps with UN growth QTL

```{r}
filepath <- "../input/All2012HeightQTL2.xlsx"
filebase <- filepath %>% basename() %>% str_replace("\\..*$","")

QTLgenes <- readxl::read_excel(filepath)[,-1]
QTLgenes <- QTLgenes %>% dplyr::rename(.id=QTL, FVTtrait=FVT) # change names to match previous file
QTLgenes <- QTLgenes %>% filter(str_detect(FVTtrait,"^UN"))
QTLgenes
```

```{r}
eigen.qtl.combined <- inner_join(eigen.annotated.small,QTLgenes,by=c("eigen_eQTL_candidate"="name")) %>%
  select(.id, trait, everything())
eigen.qtl.combined
```

how many QTL have at least some overlap?
```{r}
sort(unique(QTLgenes$.id))
sort(unique(eigen.qtl.combined$.id))
```

three of four

are all eigen genes overlapping?

```{r}
unique(eigen.annotated.small$trait)
unique(eigen.qtl.combined$trait)
```

No, 7 of 11

```{r}
write_csv(eigen.qtl.combined,
          path=str_c("../output/", filebase, "_eigenQTL_overlap_", Sys.Date(), ".csv"))
```

## overlaps and significance

first convert things to ranges
```{r}
qtl.info <- QTLgenes %>%
  group_by(.id) %>%
  summarize(chrom=unique(chrom),start=min(start),end=max(end))
qtl.info
qtl.ranges <- GRanges(seqnames = qtl.info$chrom,ranges=IRanges(start=qtl.info$start,end=qtl.info$end))
qtl.ranges <- GenomicRanges::reduce(qtl.ranges)
```

```{r}
eQTL.ranges <- GRanges(bayesint.result$chr,
                       ranges = IRanges(start=bayesint.result$start,
                                        end=bayesint.result$end))
eQTL.ranges <- GenomicRanges::reduce(eQTL.ranges)
```

Make table of chromosome info
```{r}
chr.info <- scanone_eigen.phys %>% 
  as.data.frame() %>%
  rownames_to_column("marker") %>%
  select(marker) %>%
  separate(marker,into=c("chr","bp"),sep="x",convert=TRUE) %>%
  group_by(chr) %>%
  summarize(start=min(bp),end=max(bp))
```

Do the simulations
```{r}
sims <- 1000

set.seed(2323)
sim.results <- sapply(1:sims, function(s) {
  if (s %% 100 == 0) print(s)
  sim.eQTL <- tibble(
    chr=sample(chr.info$chr,
               size = length(eQTL.ranges),
               replace = TRUE,
               prob=chr.info$end/sum(chr.info$end)),
    width=width(eQTL.ranges) # width of the QTL to simulate
  )
  sim.eQTL <- chr.info %>% 
    select(chr,chr.start=start,chr.end=end) %>% right_join(sim.eQTL,by="chr") #need to get the chrom end so we can sample correctly
  sim.eQTL <- sim.eQTL %>% mutate(qtl.start = runif(n=n(),
                                                    min = chr.start,
                                                    max= max(chr.start,chr.end-width)),
                                  qtl.end=qtl.start+width)
  sim.eQTL.ranges <- GRanges(seqnames = sim.eQTL$chr,
                             ranges = IRanges(start=sim.eQTL$qtl.start,
                                              end=sim.eQTL$qtl.end))
  
  suppressWarnings(result <- sum(countOverlaps(qtl.ranges,sim.eQTL.ranges)>0))
  result
})

```


```{r}
true.overlap <- sum(countOverlaps(qtl.ranges,eQTL.ranges)) #OK to ignore warnings

true.overlap

mean(sim.results >= true.overlap)

tibble(FVTQTL_vs_MReQTL_True_Overlaps=true.overlap,
       N_Simulations_fewer_overlaps=sum(sim.results < true.overlap),
       N_Simulations_greater_equal_overlaps=sum(sim.results >= true.overlap),
       P_value=mean(sim.results >= true.overlap)
) %>%
  write_csv(str_c("../output/", filebase, "_WGCNA_eigen_eQTL_scanone_overlap_pval_", Sys.Date(), ".csv"))
```

# cim

## Plot QTL

```{r}

threshold.95 <- tibble(perm.threshold=lod.thrs.cim[5,],
                       trait=colnames(lod.thrs.cim))

scanone.gather <- scanone_eigen_cim %>%
  gather(key = trait, value = LOD, -chr, -pos) %>%
  mutate(condition=str_sub(trait,1,2), color=str_sub(trait,6,100)) %>%
  left_join(threshold.95)

scanone.gather
```

```{r}
   pl.UN <- scanone.gather %>% filter(condition=="UN") %>%
  ggplot(aes(x=pos,y=LOD)) +
  geom_line() +
  geom_hline(aes(yintercept=perm.threshold),lty=2,lwd=.5,alpha=.5) +
  facet_grid(trait ~ chr, scales="free") +
  theme(strip.text.y = element_text(angle=0), axis.text.x = element_text(angle=90)) +
  ggtitle("UN Eigen Gene QTL")
pl.UN
ggsave("../output/eigen gene eQTL UN CIM 2012.pdf",width=12,height=8)
```


## Look for overlap

For each eigen gene, find QTL borders and look for overlap with growth QTL

For each eigen gene first identify chromosomes with "significant" peaks (in this case > 99% permuation threshold) and then runs bayesint() on them to define the intervals

```{r}
sig.chrs <- scanone.gather %>% filter(LOD > perm.threshold) %>%
  group_by(trait,chr) %>%
  summarize(unique(chr))
sig.chrs
```

now for each significant chromosome/trait combo run bayesint

```{r}
#remove markers without physical position
scanone_eigen_cim.phys <- scanone_eigen_cim[!str_detect(rownames(scanone_eigen),"^cA"),]

bayesint.list <- apply(sig.chrs,1,function(hit) {
    result <- bayesint(scanone_eigen_cim.phys[c("chr","pos",hit["trait"])], 
                     chr=hit["chr"], 
                     lodcolumn = 1,
                     expandtomarkers = TRUE
  )
  colnames(result)[3] <- "LOD"
  result
})

names(bayesint.list) <- sig.chrs$trait

bayesint.list <- lapply(bayesint.list,function(x) x %>% 
                          as.data.frame() %>%
                          rownames_to_column(var="markername")  %>%
                          mutate(chr=as.character(chr))
)

bayesint.result <- as.tibble(bind_rows(bayesint.list,.id="trait")) %>% 
  select(trait,chr,pos,markername,LOD) %>%
  separate(markername,into=c("chr1","Mbp"),sep="x", convert=TRUE) %>%
  group_by(trait,chr) %>% 
  summarize(start=min(Mbp),end=max(Mbp),min_eQTL_LOD=min(LOD),max_eQTL_LOD=max(LOD)) %>% 
  #for the high QTL peaks the interval width is 0.  That is overly precise and need to widen those.
  mutate(start=ifelse(start==end,max(0,start-20000),start), end=ifelse(start==end,end+20000,end))
  
  
bayesint.result
```

### annotate Eigen gene QTL

Load annotation
```{r}
BrapaAnnotation <- read_csv("../input/Brapa_V1.5_annotated.csv")
BrapaAnnotation
```

```{r}
eigen.annotated <- lapply(1:nrow(bayesint.result),function(row) {
  qtl <- bayesint.result[row,]
  results <- subset(BrapaAnnotation, chrom==qtl$chr &
                    start >= qtl$start &
                    end <= qtl$end)
}
)
names(eigen.annotated) <- bayesint.result$trait

eigen.annotated <- bind_rows(eigen.annotated,.id="trait") %>%
  mutate(chrom=as.character(chrom)) %>%
  left_join(bayesint.result,by=c("trait","chrom"="chr")) %>% #get eQTL LOD
  rename(eigen_eQTL_candidate=name)

eigen.annotated.small <- eigen.annotated %>% select(trait,eigen_eQTL_candidate,ends_with("LOD"))

eigen.annotated.small
```

given bayesint results, find overlaps with UN growth QTL

```{r}
filepath <- "../input/All2012HeightQTL2.xlsx"
filebase <- filepath %>% basename() %>% str_replace("\\..*$","")

QTLgenes <- readxl::read_excel(filepath)[,-1]
QTLgenes <- QTLgenes %>% dplyr::rename(.id=QTL, FVTtrait=FVT) # change names to match previous file
QTLgenes <- QTLgenes %>% filter(str_detect(FVTtrait,"^UN"))
QTLgenes
```

```{r}
eigen.qtl.combined <- inner_join(eigen.annotated.small,QTLgenes,by=c("eigen_eQTL_candidate"="name")) %>%
  select(.id, trait, everything())
eigen.qtl.combined
```

how many QTL have at least some overlap?
```{r}
unique(QTLgenes$.id)
unique(eigen.qtl.combined$.id)
```

two of four

are all eigen genes overlapping?

```{r}
unique(eigen.annotated.small$trait)
unique(eigen.qtl.combined$trait)
```

No, 2

```{r}
write_csv(eigen.qtl.combined,
          path=str_c("../output/", filebase, "_eigenQTL_overlap_CIM_", Sys.Date(), ".csv"))
```

## overlaps and signficance

```{r}
eQTL.ranges <- GRanges(bayesint.result$chr,
                       ranges = IRanges(start=bayesint.result$start,
                                        end=bayesint.result$end))
eQTL.ranges <- GenomicRanges::reduce(eQTL.ranges)
```

Do the simulations
```{r}
sims <- 1000

set.seed(4545)
sim.results <- sapply(1:sims, function(s) {
  if (s %% 100 == 0) print(s)
  sim.eQTL <- tibble(
    chr=sample(chr.info$chr,
               size = length(eQTL.ranges),
               replace = TRUE,
               prob=chr.info$end/sum(chr.info$end)),
    width=width(eQTL.ranges) # width of the QTL to simulate
  )
  sim.eQTL <- chr.info %>% 
    select(chr,chr.start=start,chr.end=end) %>% right_join(sim.eQTL,by="chr") #need to get the chrom end so we can sample correctly
  sim.eQTL <- sim.eQTL %>% mutate(qtl.start = runif(n=n(),
                                                    min = chr.start,
                                                    max= max(chr.start,chr.end-width)),
                                  qtl.end=qtl.start+width)
  sim.eQTL.ranges <- GRanges(seqnames = sim.eQTL$chr,
                             ranges = IRanges(start=sim.eQTL$qtl.start,
                                              end=sim.eQTL$qtl.end))
  
  suppressWarnings(result <- sum(countOverlaps(qtl.ranges,sim.eQTL.ranges)>0))
  result
})

```


```{r}
true.overlap <- sum(countOverlaps(qtl.ranges,eQTL.ranges)) #OK to ignore warnings

true.overlap

mean(sim.results >= true.overlap)

tibble(FVTQTL_vs_MReQTL_True_Overlaps=true.overlap,
       N_Simulations_fewer_overlaps=sum(sim.results < true.overlap),
       N_Simulations_greater_equal_overlaps=sum(sim.results >= true.overlap),
       P_value=mean(sim.results >= true.overlap)
) %>%
  write_csv(str_c("../output/", filebase, "_WGCNA_eigen_eQTL_CIM_overlap_pval_", Sys.Date(), ".csv"))
```


